1. C 推断题。由第一段“changeable weather can make it difficult to concentrate”可知人们很难集中精力在工作上。
2. A 主旨大意题。第二段主要讲述天气的变化。
3. A 细节题。由第二段“If you live in a place like Britain, where the weather seems to change daily if not hourly, you could be forgiven for thinking that the weather is random.”可知选A。
4. C 推断题。由“Red sky at night, shepherds' delight”可知，天气好牧羊人才高兴，因为可以放羊。
